/*
* WorldEdit, a Minecraft world manipulation toolkit
* Copyright (C) sk89q <http://www.sk89q.com>
* Copyright (C) WorldEdit team and contributors
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by the
* Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.sk89q.worldedit.function.visitor;
import com.sk89q.worldedit.Vector;
import com.sk89q.worldedit.function.RegionFunction;
import com.sk89q.worldedit.function.mask.Mask;
import java.util.Collection;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* Visits adjacent points on the same X-Z plane as long as the points
* pass the given mask, and then executes the provided region
* function on the entire column.
*
* <p>This is used by {@code //fill}.</p>
*/
public class DownwardVisitor extends RecursiveVisitor {
private int baseY;
/**
* Create a new visitor.
*
* @param mask the mask
* @param function the function
* @param baseY the base Y
*/
public DownwardVisitor(Mask mask, RegionFunction function, int baseY) {
super(mask, function);
checkNotNull(mask);
this.baseY = baseY;
Collection<Vector> directions = getDirections();
directions.clear();
directions.add(new Vector(1, 0, 0));
directions.add(new Vector(-1, 0, 0));
directions.add(new Vector(0, 0, 1));
directions.add(new Vector(0, 0, -1));
directions.add(new Vector(0, -1, 0));
}
@Override
protected boolean isVisitable(Vector from, Vector to) {
int fromY = from.getBlockY();
return (fromY == baseY || to.subtract(from).getBlockY() < 0) && super.isVisitable(from, to);
}
}